Throttle-valve



(NoModl.)

H. HOPKINS A. IE. JOHNSON.

A THROTTALE VALVE. No. 347,041. Patented Aug. l0, 1886.

i UNITED STATES PATENT EEicE0 HERBERT HOPKINS AND ALFRED E. JOHNSON, OFAUSTIN, NEVADA.

THRoTTLE-VALVE.

SPECIFICATION forming part of Letters Patent No. 347,041, dated Augustl0l 1886.

l Application iilcd May 24, 1886. Serial No. 203,158. (No model.)

It consists of a double disk or balance puppet-valve withguiding-fianges and intermediate disk, an eccentric mounted upon ashaftso as to rotate between the back of one ofthe valve-disks and theintermediate disk and shaft, and a handle by which it is operated so asto open or close the valve.

Referring to the accompanying drawings for a more complete explanationof our invention, Figure l is a vertical section taken in theplanefofrthe axis of the valve through it and the valve-chamber. Fig. 2is ahorizontal section through the axis of the valve and at right angleswith the section shown in Fig. l. Eig. 3 is an exterior end view.

A is the shell, which is bored to receive the valve B B. This valve is adouble disk or puppet valve, having a disk at each end, these disksforming bearings on seats in the shell, so as to close the openingsthrough which they pass. They are provided with wings or flanges, whichpass through the openings of the seats,

and serve to guide the valve as it moves outY or in.

C is a screwcap at one end ofthe valvecasing, through which the Valvemay be introduced or removed. Steam is admitted through theA passage Gin the valve-casing, passing around theinterior portion of the shell,

.so as to ,press against the opposite sides of the through the sleeveE,extending from one side of the casing and forming a bearing for theshaft.

B2 is a disk formed between the two disks B B ofthe valve, and at such apoint that the eccentric D just fits between the disks B B, with itsface in contact with both. It will be seen that when the eccentric D isturned in one direction it will move the valve backward, raising thedisks from their seats, so as to allow steam to pass through. Thenturned in thevopposite direction, it will press the valves against theirseats, thus closing them. At the same time the action of the eccentricwill be to rotate the valve upon its own axis, because the eccentricstands between the disks at one side of the central shaft which unitethe two parts of the valve. This rotation is of service in twoways-first, because it reduces the frictionbetweeu the eccentric and thedisks, and, secondly, because in rotating the valve always presents anew surface to the seat when it again closes, which has a tendency tocause the valve and seat to wear evenly and make it wear a longerperiod.

Upon the end ofthe shaft E is a lever-han dle, F, by which it isrotated, and with it the eccentric is turned. The sleeve E, throughwhich the shaft D passes, is of such a length that, in connection withthe collar or eccentric which Jrits against the sleeve froin'the inside,it will prevent leakage at this point without the use of anystuffing-box, and more especially as no steampressnre can come upon thispoint except when the valve is open.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is

l. In a throttle-valve, the body or shell having double concentricseats, a valve composed of disks fitting these seats, and anintermediate disk upon the valve-steni and connected with one of thevalvedisks by guiding-anges, in combination with an eccentric above thevalvestern, and rotating in contact with said intermediate disk and oneof the valve-disks, substantially as described.

2. The body .or shell having the double seats, the valve-.disks closingupon them, and an intermediate disk upon the valve-stem and con nectedwith one ofthe valve-disks by guiding- IOG flanges, in combination withan eccentric sup- In Witness whereof We have hereunto Set ported at oneside of the valve-stem, between our hands. said vulve-disk andintermediate disk, and in HERBERT HOPKINS. contact with seid disks@shaft upon which the ALFRED E. JOHNSON.

5 eccentric is mounted, and :t handle or lever :Lt- Vitllesses:

tuched to said shaft, by which the eccentric is J. A. MILLER,-

iotated, substantially es herein described. XV. T. Hmm'.

